Finding the Third Proportional to 12,900 and 19,908

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900 : 19,908 = 19,908 : x
2. Step 2: Convert to fraction form
   12,900/19,908 = 19,908/x
3. Step 3: Cross multiply
   12,900x = 19,908 × 19,908
4. Step 4: Simplify right side
   12,900x = 396,328,464
5. Step 5: Solve for x
   x = 396,328,464/12,900
6. Step 6: Final answer
   x = 30,723.14